Icajsntrfacturb of a new compound of zirconium and its



- Womawingg nium and ltsApplication'in the- Production. sil ViP UNITED srntrns PATEN oFFIcEJ WALTER aosnmmm AND nm'msr HARRY noon, on rnnnmeron, ENGLAND,

assrenoas T0 THEMSELVES; THE IMPERIAL rausrron THE nncouanen mum on SCIENTIFIC AND INDUSTRIAL ansnnacn, or 'Wrsmmsrnia,' LONDON, nnennnn, m RICHARD rnrnnremzmancox, or rnnnme ron,

fmmnn rn a v nanurncruan'brn comr'oumi or zmconiurr AND 'Iwsmm-moa m m Y rzeonucrzon on runs ZIRCQNIA; I a

To all whom it may 05mm.-

. 4 Be it known that we, WALTER ROSENHAIN and ERNEST HARRY Bonn, both subjects of the King of Great Britain, both residing in Teddington, England have'jointly invented a certain new an useful Improvement in the Manufacture of a New Compound of Zircoof Pure Zirconia, of which a specification. j This invention'relates' to-the manufactu stantially pure zirconia r0 mm ner -w training that compound. 'F

Th basic sulfate may; be made byj to an acid solution containing zirconium su fate and preferably cold, a suitable alkali, such as ammonia or caustic soda until the acidity of the solution haslbeen so far reduced that the whole or the greater'part of the zirconia is precipitated as the basic sulfate, leaving any iron, aluminium; manganese and like impurities in's'olution. Y

The acid solutlon of the zirconium sulfate may be made from a zirconia mineral by any of the known methods; it is preferably acid with hydrochloric acid before 'it is treated as described above, since the resence of this acid favors the freedom of t e basic sulfate the most part of' the new basic sulfate of; the chemical formula 15ZrO .2SO .14:H Or

from iron.

The precipitated basic sulfate maybe washed and dried, or after Washing it may be converted directly into zirconium hydroxid by adding an alkalisuch as ammonia solution to it before it is dried. The hyy ascination tettersratnaf P fflt j 1 1 ales meat-am13,1911; Serial no; 196,471. i

and I kilo of watefl round flDO P 5T6.

mixed together and a ded, while stirring, to 2.2 llters of sulfuric acid of specific rav- 1 ity 1.84 contained in a leaden or leadined to fume and no hydrofluoric acid can be detected in the vapor. After cooling, the mass is agitated for some time with hot or boiling water to extract thesoluble sulfates, and the whole is then diluted to .3040 liters in.

a settling an. Thecalcium'sulfate having 'cipitat'ingl-vessel. 1 a v "100 c"c.- of hydrochloric acid of specific gravity 1.15 is added-,- and ammonia of specific' gravity 0.880 is run in slowly,- while =j stirring,yuntil' .a fine-grained permanent white precipitate just begins to f0rm.- i-The 'formationjof theprecipitate, after the re ui-.

subsided, theliquor is'decan'ted into a pre-" site quantity; of ammonia has been, ad ed,

is not immediate, but continuesfor a few minutes; The basic sulfate is allowed tosettie and is washedby decantation until the jwash-liquors are free from iron andtita- .nium.

Thev hydrated basic sulfate eo prepared."

contains Y60-661 per cent. of ZrO 15' per. cent. 10 per cent. of-SO 0.1-0.2 per cent. of Fe o and a trace of Sit) It consists for which forms the subject-matter of a sepa rate application for U. S. Letters Patent.

" Having 'thus described the nature ofthe" sulfate by adding an alkali to an acid solu- I tion containing zirconium sulfate until the acidity of the solution has been so far reduced that a permanent White precipitate begins to form and then allowing precipitation to continue Without the further addition of alkali.

2. The manufacture of a basic zirconium sulfate by adding to a solution of zirconium sulfate an excess of hydrochloric acid, then running slowly into the solution, While stirring, ammonia until a fine-grained permanent white precipitate begins to form and then allowing precipitation to continue Without further addition of ammonia.

In testimony whereof We have signed our names to this specification in the presence 1'5 of two subscribing witnesses.

WALTER ROSENHAIN. ERNEST HARRY RODD.

Witnesses to the signature of \Valter Rosenhain C. S. HOPKINS, E. C. WALKER.

Witnesses to the signature of Ernest Harry Rodd:

ERNALD S. MosELnY, MANSUR CLAUD. 

